Damper disk of a rubber-series type

ABSTRACT

A damper disk of a rubber-series type including elastic members made from rubber, in which second arms are provided with support members made from elastic material having a high rigidity and operable to increase the pushing force transmitting area from the second arms to the elastic members. Rubber sheets are provided between the second arms and the elastic members and the end surfaces of the support members, being of enlarged area, prevent deformation of the rubber sheets.

(Applicable Field)

The present invention relates to an improvement of a damper disk of arubber-series type using elastic members made from rubber.

(Background Art)

The applicant has already developed a clutch disc shown in FIG. 4 andhas filed an application for it as Japanese Utility Model Application58-87448 and published Dec. 19, 1984 as Patent Publication 59-191426.

In FIG. 4, a spline hub 10 is provided with at least two radial firstarms 12, 12a, and cylindrical rubbers 18 are disposed between the firstarms 12, 12a and retainer plates 14, 14a with rubber sheetstherebetween, respectively.

In FIG. 4a illustrating a section taken along line a--a in FIG. 4, whenthe cylindrical rubbers 18 are compressed, the retainer plates 14, 14ahaving relatively small thickness of t compress the rubber sheets 16 andthe cylindrical rubbers 18, so that the rubber sheets 16 largely deflectand bend as shown at image line in the figure, and in a extreme case,they may break.

(DISCLOSURE OF INVENTION)

It is an object of the invention to provide a damper disk of arubber-series type, overcoming the above problems, in which it ispossible to prevent large deflection of sheets which transmitcompression force to elastic members made from rubber.

(STRUCTURE OF INVENTION)

(1) Technical Means

According to the invention, a damper disk of a rubber-series typeincludes a spline hub continuously provided with a radial hub flange inwhich at least two first arms are formed, two side plates disposed atopposite sides of the hub flange, retainer plates disposed between thehub flange and the side plates and including second arms faced to thefirst arms, and elastic members made from rubber and disposed betweenthe both arms and in openings formed in the side plates; and ischaracterized in that the second arms of the retainer plates areprovided with support members made from elastic material having a highrigidity and operable to increase pushing force transmitting area fromthe second arms to the elastic members, and end surfaces of the supportmembers facing to the elastic members are projected by predetermineddistance in directions of the rubber members beyond the end surfaces ofthe second arms facing to the elastic members.

(2) Operation

The end surfaces of the support members having large area transmit acompression force to the elastic members of the rubber prior to the endsurfaces of the second arms, so that the rubber sheets are preventedfrom deflection.

Torsional characteristics at an initial stage is adjusted by theelasticity of the support members itself.

(BRIEF DESCRIPTION OF THE DRAWINGS)

FIG. 1 is a plane view of a clutch disk employing a first embodiment ofthe invention,

FIG. 2 is a sectional view taken along line II--II in FIG. 1,

FIG. 3 is a sectional view taken along line III--III in FIG. 1,

FIG. 3a is fragmentary sectional view illustrating a fully compressedcylindrical rubber,

FIG. 3b is a fragmentary sectional view illustrating a second embodimentof the invention,

FIG. 4 is a plane view illustrating the prior art of my JapanesePublication 59-191426, and

FIG. 4a is a sectional view taken along line a--a in FIG. 4.

(Best Mode for Carrying Out the Invention)

(1) First embodiment

In FIG. 1 illustrating a clutch disk for an automobile in which theinvention is employed, portions same as or corresponding to those inFIG. 4 bear same reference numerals.

In FIG. 2 illustrating a section taken along line II--II in FIG. 1, aspline hub 10 is splined to an output shaft (i.e., input shaft of atransmission), shown only by a center line O--O, and is continuouslyprovided with first arms 12, 12a which extend radially outwardlytherefrom to form a hub flange. Side plates, i.e., a clutch plate 20 anda retaining plate 22, which are located at opposite sides of the arms12, 12a with predetermined axial spaces therebetween, are rotatablydisposed around the hub 10. The outer peripheral portion of the clutchplate 20 is fixed to a friction facing 26 by means of cushioning plates24.

At the right portion in the figure, the retainer plate 14 and a subplate 21 are pinched between the first arm 12, the clutch plate 20 andthe retaining plate 22, and in the left portion, a retainer plate 14aand sub plate 21a are pinched between them (2, 20, 21). Nearly annularbushings 23, 23a are interposed between the inner peripheries of theseplates and the hub 10, and the clutch plate 20 and the retaining plates22 are provided with circumferentially spaced four projections 25, 27,which are fitted into hollows 29 formed in the bushings 23, 23a toconnect the plates to the bushings, respectively.

The clutch plate 20 and the retaining plate 22 are fixed together bycircumferentially spaced two stop pins 28 and four support pins 30 (FIG.1). The stop pins 28 are circumferentially movably fitted in recesses 32formed at the outer peripheral surfaces of the first arms 12, 12a.

At 34 is indicated a relatively weak first spring which is compressivelydisposed between a window 35 in the first arm 12a and the windows in thesub plates 21, 21a. The windows 35, 35a for the first spring 34 haveradial end surfaces which are, as shown in FIG. 1, registered to eachother, so that the first torsion spring 34 may be compressed at a regionof a torsion angle of 0 or more degrees.

A second torsion spring 36, which is stronger than the first spring 34,is circumferentially spaced by nearly 180 degrees to the first spring34. The second spring 36 is disposed between the window 37 in the firstarm 12a and the windows 37a in the sub plates 21, 21a. A space L1 isformed between the radial end surfaces of the windows 37, 37a.

Thus, after the first arm 12a is twisted to turn the space L1, thesecond spring 36 starts to be compressed. The inner peripheral portionsof said retainer plates 14, 14a are, as shown in FIG. 2, axially spacedwith the first arms 12, 12a therebetween, and are axially inwardlycurved as the positions thereof changes in the radially outwarddirection, so that they may overlap the first arms 12, 12a in thecircumferential direction (perpendicular to the sheet of FIG. 2).

The outer peripheral portions of the retainer plates 14, 14a are, asshown in FIG. 1, diverged into nearly partial circular shapes to formsecond arms 38, 38a which are faced to the first arms 12, 12a,respectively. Circumferentially spaced six cylindrical rubbers 18(elastic members) are disposed between the first arms 12, 12a and thesecond arms 38, 38a and between the second arm 38 and 38a with rubbersheets 16 therebetween.

The rubber sheets 16 are provided at central portions thereof withprojections 39, which are fitted into hollows 39a in the cylindricalrubbers 18 to connect them together. The cylindrical rubbers 18 havecentral penetration apertures 40.

The sub plates 21, 21a are provided with recesses 19, in which therubber sheets 16 and the cylindrical rubbers 18 are disposed, and spacesL2 are formed between the end surfaces of the recesses 19 and the endsurfaces of the first arms 12a. The space L2 is wider than said spaceL1, so that the second spring 36 is compressed before the rubbers 18start to be compressed.

Support members 41, which are summary of the invention, are fixed byrivets 42 to the second arms 38, 38a. As shown in FIG. 3 illustrating asection taken along line III--III in FIG. 1, each support member 41 hasa nearly rectangular section with a hollow at one side. Spaces δ, whichwill be detailed later, are formed between end surfaces 44 of the secondarms 38, 38a and end surfaces 46 of the support members 41. Thesesupport members 41 are made from elastic material having high rigidity,such as nylon resin. Therefore, the support members 41 are deformable ina region of the space δ which exhibiting a large elastic force.

The length of each space δ is so determined that the end surfaces 44, 46may form a single plane, as shown in FIG. 3a, and thus, may push endsurfaces 48 of the rubber sheets 16 through the whole area by asubstantially uniform pressure.

Thus, when the spaces δ, which decrease as the torsion angle increases,is formed between the end surfaces 44 and 46, the elastic force from thecylindrical rubbers 18 is transmitted through the support members 41having said elastic force to the first arms 12, 12a, and anyunpreferable torsional force is not applied to the retainer plates 14,14a from which the circumferentially spaced second arms 38, 38a ofpartially circular shape are partially cut and bent. Thus, the oppositeend surface of each support member 41 is connected to the first arm 12or 12a successively through the adjacent rubber sheet 16, thecylindrical rubber, the rubber sheet 16 and the support member 41.

A pair of the support members 41 are disposed on the upper and lowersurfaces, in FIG. 3, of each of the second arms 38, 38a and are fixedthereto by one rivet 42.

The cylindrical rubbers 18, the support members 41 and others describedabove are disposed in the openings 21, 21a in the clutch plate 20 andthe retaining plate 22, as shown in FIG. 1.

Although the rivets 42 are fixed to the support members 41 and thesecond arms 38, 38a, they may be inserted, as shown at image line inFIG. 3, into apertures 50 having diameters larger than those of therivets 42 formed in the second arms 38, 38a so as to more securelyprevent the transmission of the torsion torque from the support members41 to the second arms 38, 38a.

An operation is as follows. In the clutch disk described above, whenpower of the engine is introduced from the friction facing 26, thetorsion in the circumferential direction of the clutch occurs betweenthe first arms 12, 12a connected to the spline hub 10 and the clutchplate 20 and retaining plate 22. When the torsion angle is relativelysmall, the first spring 34 is initially compressed to produce a smalltorsion torque.

When the torsion angle increases and the sub plates 21, 21a turn by anangle corresponding to the space L1 in FIG. 1, the second spring 36starts to be compressed, so that the spring force of the second spring36 is added to that of the first spring 34 to produce a large torsiontorque.

When the torsion angle further increases to a value corresponding to thespace L2, the cylindrical rubbers 18 start to be compressed to producethe torsion torque through a wide torsion angle region.

As described above, when the cylindrical rubbers 18 are compressed, asshown in FIG. 3, the end surfaces 48 of the rubber sheets 16 receive thepushing force from the end surfaces 46 which closely contact through thearea remarkably larger than that in conventional case in FIG. 4, tocompress the cylindrical rubbers 18. Therefore, the pressure on thesurfaces 48 are remarkably reduced as compared with the conventionalcase in FIG. 4, so that the large deformation of the rubber sheets 16 bythe second arms 38, 38a, which may be caused in the conventional case,is prevented.

While the space δ shown in FIG. 3 remains between the end surfaces 44and 46 in the course of the compression of the cylindrical rubbers 18,the torsion torque is transmitted from the support members 41 to thefirst arms 12, 12a and the unpreferable torsion force is not transmittedto the second arms 38, 38a.

At the condition in FIG. 3a, in which the cylindrical rubbers 18 arefully compressed, each of them deflects through the distancecorresponding to the space δ, and the both end surfaces 44 and 46 formsubstantially same planes, respectively, and are substantially entirelypressed onto the end surfaces 48 of the rubber sheets 16. Therefore, thepushing force transmission area further increases as compared with thecondition in FIG. 3.

(2) Second Embodiment

In FIG. 3b illustrating the second embodiment of the invention andcorresponding to the section taken along line III--III in FIG. 1,structures except for those in FIG. 3b are nearly same as the firstembodiment.

In FIG. 3b, the support members 41 are arranged on both of the upper andlower surfaces, in FIG. 3, of each of the second arms 38, 38a and arefixed by the one rivet 42 thereto. Therefore, the end surfaces 48 of therubber sheets 16 are compressed by the end surfaces 44 and 46 which formsame planes, respectively.

In the structures in FIG. 3b, when the cylindrical rubbers 18 arecompressed, the end surfaces 48 of the rubber sheets 16 receive thepushing force from the end surfaces 44 and 46 which closely contact themthrough the substantially whole area thereof. Therefore, the pressure ofthe end surfaces 48 is remarkably reduced as compared with theconventional case in FIG. 4a, so that the large deformation of therubber sheets 16 by the second arms 38, 38a, which may be caused in theconventional case, is prevented.

(EFFECT OF THE INVENTION)

In the damper disk of the rubber-series type according to the invention,as described above, the second arms 38, 38a of the retainer plates 14,14a are provided with the support members 41 which are made from theelastic material having the high rigidity and increase the pushing forcetransmission area to the rubber sheets 16 and the cylindrical rubbers 18(elastic members) from the second arms 38, 38a, and the spaces δ areformed between the end surfaces 44 of the second arms 38, 38a facing tothe rubber sheets 16 and the cylindrical rubbers 18 and the end surfaces46 of the support members 41 facing to the rubber sheets 16 and thecylindrical rubbers 18. Therefore, the pressure of the end surfaces 48is remarkably reduced as compared with the conventional case in FIG. 4a,so that the large deformation of the rubber sheets 16 by the pushingforce from the second arms 38, 38a, which may be caused in theconventional case, is prevented, which results in improvement of thedurability of the rubber sheets 16.

Therefore, the durability and reliability is improved in the clutch diskof the rubber-series type, in which the compression force is transmittedby the relatively thin first arms 12, 12a and the second arms 38, 38a tothe cylindrical rubbers 18 and the rubber sheets 16 having the largesectional area.

(OTHER EMBODIMENTS)

(1) The present invention can be applied not only to the clutch diskdescribed above but also to damper disks for torque converters.

(2) The support members 41 are made not only from the nylon but alsofrom other elastic material having high rigidity such as hard nitrilerubber.

We claim:
 1. A damper disc of a rubber-series type including a spline hub continuously provided with a radial hub flange in which at least two first arms are formed, two side plates disposed at opposite sides of the hub flange, retainer plates disposed between the hub flange and the side plates and including second arms faced to said first arms, and elastic members made from rubber and disposed between said both arms and in openings formed in said side plates; characterized in that the second arms of the retainer plates are provided with support members fixed to each respective second arm by one rivet and made from elastic resin material for increasing pushing force transmitting area from the second arms to the elastic members, and end surfaces of the support members facing to the elastic members and projected by predetermined distances in the direction of the rubber members beyond the end surfaces of the second arms facing to the elastic members, said end surfaces of said second arms, in the circumferential direction of said damper disk when said elastic members are not compressed, being spaced from said facing elastic member.
 2. A damper disk of a rubber-series type including a spline hub continuously provided with a radial hub flange in which at least two first arms are formed, two side plates disposed at opposite sides of the hub flange, retainer plates disposed between the hub flange and the side plates and including second arms faced to said first arms and elastic members made from rubber and disposed between said both arms and in openings formed in said side plates; characterized in that the second arms of the retainer plates are provided with support members fixed to each respective second arm by one rivet and made from elastic resin material for increasing pushing force transmitting area from the second arms to the elastic members, end surfaces of the support members facing to the elastic members are registered with the end surfaces of the second arms facing to the elastic members.
 3. A damper disk of a rubber-series type including a spline hub (10) continuously provided with a radial hub flange in which at least two arms (12, 12a) are formed, two side plates (20, 22) disposed at opposite sides of the hub flange, retainer plates disposed between the hub flange and the side plates (20, 22) and including second arms (38, 38a) faced to said first arms (12, 12a), and elastic members (18) made from rubber and disposed between said both arms and in openings formed in said side plates (20, 22); characterized in that the second arms (38, 38a) of the retainer plates are provided with support members (41) made from elastic resin material for increasing pushing force transmitting areas from the second arms (38, 38a) to the elastic members (18), end surfaces of the support members (41) facing to the elastic members (18) are projected by predetermined values in directions of the rubber members beyond the end surfaces of the second arms (38, 38a) facing to the elastic members (18), the opposite end surfaces of the rubber members (18) are provided with rubber sheets (16), projections formed at central portions of the rubber sheets (16) are fitted into hollows of the rubber members (18) to connect the rubber members (18) to the rubber sheets (16), the support members (41) are provided at opposite surfaces of the second arms (38, 38a) and are fitted thereto by one rivet, the spaces between the end surfaces of the support members (41) and the end surfaces of the second arms (38, 38a) are so determined that both of the end surfaces may form substantially same planes, respectively, due to the compression of the support members when the elastic members (18) are fully compressed, two sub plates are rotatably arranged with respect to the first arms (12, 12a) with the first arms (12, 12a) therebetween, first and second torsion springs which operate at a low torsion angle region are disposed between openings in the first arms and the openings in both of the sub plates, a narrow space is formed between the end surfaces of the openings in the sub plate and the openings in the first arms (12, 12a) in which the second torsion spring is arranged, the rubber members (18) and the rubber sheets (16) are disposed in recesses in the sub plates (16), and a wide space is formed between the end surfaces of the recesses and of the first arms (12, 12a).
 4. A damper disk of the rubber-series type including a spline hub (10) continuously provided with a radial hub flange in which at least two first arms (12, 12a) are formed, two side plates (20, 22) disposed at opposite sides of the hub flange, retainer plates disposed between the hub flange and the side plates (20, 22) and including second arms (38, 38a) faced to said first arms (12, 12a), and elastic members (18) made from rubber and disposed between said both arms and in openings formed in said side plates (20, 22); characterized in that the second arms (38, 38a) of the retainer plates are provided with support members (41) made from elastic material having a high rigidity and operable to increase pushing force transmitting area from the second arms (38, 38a) to the elastic members (18), end surfaces of the support members (41) facing to the elastic members (18) are registered with the end surfaces of the second arms (38, 38a) facing to the elastic members (18), the opposite end surfaces of the rubber members (18) are provided with rubber sheets (16), projections formed at central portions of the rubber sheets (16) are fitted into hollows of the rubber members (18) to connect the rubber members (18) to the rubber sheets (16), the support members are provided at opposite surfaces of the second arms (38, 38a) and are fixed thereto by one rivet, two sub plates are rotatably arranged with respect to the first arms (12, 12a) with the first arms (12, 12a) therebetween, first and second torsion springs which operate at a low torsion angle region are disposed between openings in the first arms and the openings in both of the sub plates, a narrow space is formed between the end surfaces of the openings in the sub plate and of the openings in the first arms (12, 12a) in which the second torsion spring is arranged, the rubber members (18) and the rubber sheets (16) are disposed in recesses in the sub plate (16), and a wide space is formed between the end surfaces of the recesses and of the first arms (12, 12 a). 